Rectifier electrode



oct. 2', 192s. 1,686,316

E. w. ENGLE RECTIFIER ELECTRODE Filed Jn. 7, 1927 Patented ou. e, 192s;

wouriso STATES n PATENT eerie MAB ENGTLE., GF LAKE FOREST, ILLIN, .SSGNOB T0 STE'ELA OOIPEY, ENG., 0l' NORTH CHICAGO, ILLINQS, A CGB'iRATGN QN NEW T. ,MK

BEUIIVFIEB IELECTRD.

pplioation nle January 7, 192'?. Serial No. 1593321.

My invention relates to improvements in rectifier electrodes und is applicable especially to the continuous, silent lmd permanent type of electrolytic battery chargers such as that illustrated l Patent No. 1,495,582, issued Mey 27, 1924, and reissued as No. 16,438, on October 12, 1926. The object of the invention is to provide n non-film forming electrode which will not 10 disintegrate or decompose when subjected to continuous use eration and which will enhance the life of the battery charger. I have discovered that rhodium possesses remarkable and unexpectlli ed qualities und that unlike platinum, pleti num-iridium, carbon and lead, it is not aprcciably decomposed h the acid electrolyte, n the gases formed, or y electrolytic action. A further object .is to provde an improved lo method of elcctrolytic rectification by the use of this im irovcd electrode. Y K Other oirjects and advantages will appear from time to time as the description of the invention progresses.

A preferred embodiment of the invention 4is illustrsted .in which diagreminntionlly illustrates the elecn trolytio battery charger. A receptacle 1, of suitable Vncidproof material, contains un :so electrolyte 2, preferebiy sulphuric acid (speeiiic gravity i200). To the electrolyte, n suitu'ole salt such es ferrous sulphate may he 'added to decrease the internal resistance oi the cell, if desired. In this solution ure sus- 35 pended, by any suitnble Ineens, u. film-forni` ing electrode 3 und e, rhodium electrode ll. The ilm forming electrode 3 is preferably a tsntnlum strip or ribbon with an immersed arco. of about .37 square inches. However, it w 'is to be understood that any suitable film forming electrode may be used und that the area, may be lvaried under different condlind described 'in my former which will be efficient in op' the accompanying drawing tions. By the use of the term rhodium both the pure metal end alloys, euch es comin arcial rhodium, which contains iridium, und ello i s 45 with lead, platinum, etc., are inciuded. T ,e strips or ribbons of tantulum end rhodium are bent, as shown in the drawing, sind secured to terminals 5 and 6. Connectors 'i' and f 7 are attached to said terminals sind form 50 the secondary circuit of e' trznisormcr, The connector 10 from the tantaium electrode should be securedto the positivepole of the battery to be ehe-reed and. the connector 11 to the negative. tilhe trens'formerwis die '55 grammatica-ily shown es inciudin the sec ondary coil l2 und the primary coi 13 which is connected by Wires 14 end 15 to ping i5 adapted to be inserted in e socket it connected by leads 18 and 19 thesource. out 00 current represented. b Wires 20 and 2i..

It is understood, o course, tiret the shove embodiment is givenby wey of exemple only and I do'ryot `limit myself to the speciiio modi ication shown. `I include ali improvements' o5 and inodilicetions that fell. Within *the scope of the following claims, 't

l claim: u

l. In electrolytic apparatus, s non-iiim forming electrode comprising rhodium, e film 7o forming electrode end en electrolyte.

2. In an electroiytio rectifier, the combinetion of e rhodium electrode, s tentnium ciectrode and. an electrolyte. y

3. In en elcctrolytic rectifier, the eoinbina.- 75 tion of a rhodium electrode, e tontelum electrode and :t sulpliuric acid electrolyte.

f1. ln un electroiytio device, a rhodium elec trode, n tuntnluno` electrode and sui iiurie scid electrolyte, to which has been es ded. n S9 small amount of n metal ofthe iron group.

1n Witness whereof, fl hereunto soiiscrihe my nume this 5th day ot isnuery 132'?. v

l EDGAR lV. ENGL-E, 

